A depth finder shows that the water in a certain place is 620 feet deep. The diffidence between d, the actual depth of the water, and the reading is |d-620| and must be less than or equal to 0.05d. Find the minimum and maximum values of d, to the nearest tenth of a foot.

Question

anonymous · Answer

is it 
"less than or equal to .05d" or 
"less than or equal to .05"?

anonymous · Answer

first one

anonymous · Answer

ok

anonymous · Answer

$$|d-320|\leq .05d$$ means either 
$$d-320\leq .05d$$ and
$$d-320\geq -.05d$$ so we have to solve these two seperately

anonymous · Answer

$$d-320\leq .05d$$
$$.95d\leq 320$$
$$d\leq 320\div .95$$
$$d\leq 336.84$$

anonymous · Answer

that is the first one
can you do the second?  similar
os is very slow today

anonymous · Answer

@satellite73 - your method is correct, but I think that you made a mistake by using |d-320| instead of |d-620|